Acadian Gas Pipeline System

From Global Energy Monitor
This article is part of the Global Fossil Infrastructure Tracker, a project of Global Energy Monitor.

Acadian Gas Pipeline System is an operating natural gas pipeline system in Louisiana, USA.[1]


The pipeline runs from the Haynesville shale field, to Baton Rouge, Louisiana, to New Orleans, Louisiana, and through Acadia and Vermillion Parishes.[2]

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Project details

  • Operator: Enterprise Products Partners LP[3]
  • Owner: Enterprise Products Partners LP[1]
  • Parent company: Enterprise Products Partners LP
  • Capacity: 1.8 bcf/d (after Acadian Haynesville Extension)[1][3]2.1 bcf/d (after Gillis Lateral became operational); 2.5 bcf/d total with Acadian Haynesville Extension Expansion
    • Originally 1000 Mmcf/day[4][5]
  • Length: 1,000 miles[1][5]
  • Diameter: 30, 36, 42 inches[3]
  • Status: Operating[1]


The Acadian Gas Pipeline System transports natural gas from onshore developments and, through connections with offshore pipelines, Gulf of Mexico production to local gas distribution companies, electric generation and industrial customers, including those in the Baton Rouge–New Orleans–Mississippi River corridor.[1]

An original system of pipelines was in operation in southern Louisiana in the early 2000s. Enterprise Product Partners acquired Acadian Gas LLC from an affiliate of Shell Company for $244 million.[4][6]Acadian consisted of three Louisiana Intrastate pipeline systems with over 1000 miles combined length and a total capacity of One billion cubic feet per day.[4]

Enterprise Products Partners has a 100% ownership interest in the pipeline system.[1] Enterprise acquired the pipeline system through its September 2000 acquisition of Acadian Gas, LLC from Coral Energy, LLC, an affiliate of Royal Dutch Shell, for US$226 million in cash.[7]

Expansion projects

Acadian Haynesville Extension

  • Operator: Enterprise Products Partners LP
  • Owner: Enterprise Products Partners LP[1]
  • Parent company: Enterprise Products Partners LP
  • Capacity: 1800 Million cubic feet per day[3]
  • Length: 270 miles[3][5]
  • Diameter: 30, 36, 42 inches[3][5]
  • Status: Operating[8]
  • Start year: 2011[3]
  • Cost: $1560 Million[3][5]

In October 2009, Enterprise Products Partners LP and Duncan Energy Partners LP announced plans to extend the Acadian gas pipeline system into northwestern Louisiana.[9] This project is called the Haynesville Extension and is now considered part of the full Acadian Gas Pipeline System. The extension project added 270 miles of 42- an 36-inch pipeline with a capacity of 1.8–2.1 billion cubic feet per day.[5] The Haynesville Extension was completed in November 2011 and entered into service that year.[3]

Gillis Lateral Pipeline

  • Operator: Enterprise Products Partners LP
  • Owner: Enterprise Products Partners LP[1]
  • Parent company: Enterprise Products Partners LP
  • Capacity: 1 billion cubic feet per day[10][11]
  • Length: 83 miles[10][11]
  • Status: Operating[8]
  • Start year: 2021[10]

In October 2019, Enterprise announced a proposal to extend the Acadian Gas Pipeline System with an 80-mile, 1 billion cubic feet per day pipeline within Louisiana.

The lateral extension will connect the Acadian Gas Pipeline System's mainline to Gillis, Louisiana.[12] It originates near Alexandria, Louisiana on the Acadian Haynesville Extension system and extends to Gillis, Louisiana.[11]

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When proposed, the Gillis Lateral Pipeline was expected to lead to a net increase in the capacity of the Acadia Gas Pipeline System of 300 million cubic feet per day, from 1.8 to 2.1 billion cubic feet per day.[10]

As of September 2021, construction did not appear to have formally started on the pipeline, though Enterprise Products Partners LP did appear to be hiring for the work.[13]

In December 2021, Enterprise Products Partners announced that the Gillis Lateral pipeline had started commercial service, with the capability to transport about 1 billion cubic feet per day of natural gas. An Enterprise official said, "The Gillis Lateral is fully subscribed with long-term, firm commitments from shippers".

Acadian Haynesville Extension Capacity Expansion

  • Operator: Enterprise Products Partners LP
  • Owner: Enterprise Products Partners LP[1]
  • Parent company: Enterprise Products Partners LP
  • Capacity: 400 MMcfd[14]
  • Length: 0 new miles
  • Diameter:
  • Status: Operating[14]
  • Start year: 2023[14]
  • Cost:

In May 2023, Enterprise Products Partners announced that the 400 MMcfd expansion became operational, bringing the full capacity of the system up to 2.5 bcf/d.[15] The expansion "provides additional supply to existing and new industrial developments in the Mississippi River Corridor and the growing Louisiana LNG export market," said Natalie K. Gayden, senior vice president of Enterprise's fossil gas business.[16]

Articles and resources


  1. 1.0 1.1 1.2 1.3 1.4 1.5 1.6 1.7 1.8 1.9 Natural Gas Pipelines & Services, Enterprise Products Partners L.P., accessed Sep. 1, 2021.
  2. Map of Enterprise Pipelines, Enterprise Products Partners LP, accessed Sep. 1, 2021.
  3. 3.0 3.1 3.2 3.3 3.4 3.5 3.6 3.7 3.8 Natural Gas: Pipelines, US Energy Information Administration, Jul. 27, 2021, accessed Aug. 18, 2023.
  4. 4.0 4.1 4.2 "Our History - Enterprise Products". Retrieved 2023-08-18.
  5. 5.0 5.1 5.2 5.3 5.4 5.5 "Enterprise Products Partners LP, Investor Presentation". U.S. Securities and Exchange Commission. October 2010. Retrieved 18 August, 2023. {{cite web}}: Check date values in: |access-date= (help)CS1 maint: url-status (link)
  6. "Acadian Gas Pipeline System, Acquired by Enterprise Products Partners LP on September 25th, 2000 | Mergr". Retrieved 2023-08-18.
  7. Enterprise Acquires Acadian Natural Gas Pipeline System, News Release, Sep. 25, 2000.
  8. 8.0 8.1 Enterprise says new pipeline serves US Gulf Coast LNG terminals, Dec. 16, 2021
  9. Christopher E. Smith, Enterprise, Duncan to expand Acadian gas line into Haynesville shale, Oil & Gas Journal, Oct. 28, 2009, accessed Sep. 1, 2021.
  10. 10.0 10.1 10.2 10.3 Enterprise to extend Acadian Gas Pipeline System in Louisiana, Pipeline & Gas Journal, Sep. 20, 2019, accessed Sep. 1, 2021
  11. 11.0 11.1 11.2 "Our History - Enterprise Products". Retrieved 2023-08-18.
  12. Two Haynesville-area pipeline projects due in 2021, Aegis Hedging, accessed Sep. 1, 2021.
  13. Job description - Technician, Enterprise Products Partners LP, archived from the original on Sep. 2, 2021.
  14. 14.0 14.1 14.2 "". {{cite web}}: External link in |title= (help)CS1 maint: url-status (link)
  15. E. Smith, Christopher (31 May, 2023). "EPP completes 400-MMcfd Acadian Haynesville Extension expansion". Oil & Gas Journal. Retrieved 18 August, 2023. {{cite news}}: Check date values in: |access-date= and |date= (help)
  16. "". {{cite web}}: External link in |title= (help)CS1 maint: url-status (link)

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External resources

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